<!DOCTYPE html>
<meta charset="utf-8" />
<title>Interaction of 'inert' attribute with modal dialog</title>
<link rel="author" title="Peng Zhou" href="mailto:zhoupeng.1996@bytedance.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#inert">
<meta name="assert" content="Checks that a modal dialog escapes inertness from ancestors.">
<div id="log"></div>
<div id="wrapper">
  find wrapper
  <dialog id="dialog">
    find dialog
    <span id="child">
      find child
    </span>
  </dialog>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function cleanup() {
  dialog.close();
  getSelection().removeAllRanges();
}

function setupTest(element, context) {
  element.inert = true;
  dialog.showModal();
  context.add_cleanup(() => {
    element.inert = false;
    cleanup();
  });
}

setup(() => {
  dialog.showModal();
  add_completion_callback(cleanup);
});

test(function() {
  setupTest(child, this);
  assert_false(window.find("wrapper"));
  assert_true(window.find("dialog"));
  assert_false(window.find("child"));
}, "Inner nodes with 'inert' attribute become inert anyways");

test(function() {
  setupTest(dialog, this);
  assert_false(window.find("wrapper"));
  assert_false(window.find("dialog"));
  assert_false(window.find("child"));
}, "If the modal dialog has the 'inert' attribute, everything becomes inert");

test(function() {
  setupTest(wrapper, this);
  assert_false(window.find("wrapper"));
  assert_true(window.find("dialog"));
  assert_true(window.find("child"));
}, "If an ancestor of the dialog has the 'inert' attribute, the dialog escapes inertness");
</script>